Brush assembly utilizing lengths of brush strip



Jan. 19, 1960 R. PETERSON BRUSH ASSEMBLY UTILIZING LENGTHS OF BRUSH STRIP Filed Sept. 19. 1955 2 Sheets-Sheet 1 INVENTOR. F055 0. Pf7'fR50N TOLMCZJ A T TOR/V5 Y5 Jan. 19, 1960 R. o. PETERSON BRUSH ASSEMBLY UTILIZING LENGTHS OF BRUSH STRIP Filed Sept. 19. 1955 2 Sheets-Sheet 2 5 y m 5 mm m WM o 2 v H 0 mm U R United State BRUSH ASSEMBLY UTILIZING LENGTHS OF BRUSH STRIP Ruben 0. Peterson, University Heights, Ohio, assiguor to The Osborn Manufacturing Company, Cleveland, Ohio, a corporation of Ohio Application September 19, 1955, Serial No. 535,045 14 Claims. (Cl. 15-182) generally radially outwardly therefrom.

My prior Patent 2,714,738 illustrates and describes an improved brush assembly falling within this same general category, and the present invention constitutes a further improvement in this field. Whereas the lengths of brush strip are inserted axially in notches in the outer peripheries of a series of aligned discs in accordance with the teaching of my patent 2,714,738, I have found it to be desirable in many circumstances to provide for insertion of the brush strip in a radial rather than an axial direction. It is very desirable that brushes of the general type with which I am here concerned be constructed in a manner facilitating rapid and easy removal of worn lengths'of brush'strip and substitution of new lengths of strip therefor. On the other hand, the brush strip must be secured to the hub in a manner to assure that it will not work loose under the effect of vibratory action in use.

It is accordingly a principal object of my invention to provide a novel brush assembly wherein lengths of brush strip may be inserted with a minimum of difiiculty but which strip will then be firmly seated and secured in use.

Another object is to provide such brush assembly wherein lengths of brush strip may thus be inserted in a radial rather than an axial direction, this considerably facilitating the insertion of lengths of brush strip which are of long lead helical conformation rather than extending exactly parallel to the tool axis.

Still another object is to provide such brush assembly which will be reasonably inexpensive of construction and which may be of any desired length.

Other objects of the invention will appear as the description proceeds.

To the accomplishment of the foregoing and related ends, said invention then comprises the features hereinafterfully described and particularly pointed out in the claims, the following description and the annexed drawing setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principle of the invention may be employed.

In said annexed drawing:

Fig. 1 is afragmentary view of a power driven rotary brushin accordance with my'invention wherein lengths of brush strip extend parallel to the axis of rotation;

Fig. 2 is a similar view of a rotary brush assembly wherein'the brush strip is of long lead helical conformation; r

Fig. '3 illustrates a modified form of construction wherein the lengths of brush strip are mounted upon a tu-bula'r hub-member;

Fig. 4is=a de'tail end view of the brush strip mounting means of Fig. 1; and

ice

Fig. 5 is a detail end view of the brush strip mounting means of Fig. 3.

Referring now more particularly to said drawing, my new brush assembly is adapted to utilize commercially available brush strip of well-known type and especially brush strip of the type illustrated and described in my prior Patent No. 2,303,386. A variety of different forms of brush strip are commercially available, but in general they include a channelform sheet metal back 1 having brush material 2 retained therein and extending therefrom in a continuous layer, such brush material being doubled about an elongated retaining element 3 extending longitudinally within such channelform back and preferably secured therein by means of teeth 4 which may be punched in from the channel sides as taught in my aforesaid Patent 2,303,386.

In the Fig. l embodiment, a series of stepped discs 5 are secured to a central shaft or arbor 6 by means of set screws or the like and provided with a series of aligned notches, in this case four in number. The metal stamped out of the disc edge portions to form such notches is bent to form flanges 7 protruding in the same direction parallel to the axis of the disc. The channel backs l of the lengths of brushstrip are seated in the resultant peripheral notches, ordinarily in a radial direction, with such flanges 7 bearing against one side of each brush strip back and affording much more lateral support than would be atforded by the relatively thin discs 5. A longitudinally extending metal strip 8 having an inturned outer edge 9 and an outwardly turned inner edge 10 is provided engaging the opposite side of the channelform back and fitting within the notches in the discs. Tapering wedge shaped keys 11 may now be driven into such notches, with the outwardly bulged sides of such wedges fitting in corresponding recesses in the notch sides and such keys also overlying the outwardly turned inner edge portions ill of the retainer strips 8. Theinwardly turned outer edge portions 9 of such retainer strips hook over one side edge of each of the channel brush strip backs 1, and it will accordingly be seen that such insertion of wedges 11 results in the lengths of brush strip being both very firmly and rigidly seated within the notches in discs 5 and also in their being secured against radially outward movement.

The Fig. 2 form of the invention is generally similar to that illustrated in Fig. 1 but shows a smaller number of brush strips employed, with these being secured in notches in discs 5, the peripheral positions of which have been relatively rotated about the axis of shaft 6 so as to afford a long lead helical pitch. With this type of construction, it is obviously considerably easier to insert the brush strip radially into the supporting notches rather than to insert such strip axially. In both forms, the radially inner portion of the brush strip back 1 is supported upon the shoulders 12 of the hub members and not merely upon the thickness of the relatively thin notched disc portions 5.

Now referring more particularly to Fig. 3 of the drawing, in the embodiment there illustrated means is provided for mounting the lengths of brush strip upon a cylindrical hub member 13. Such means comprise a tubular sleeve member 14 to which are Welded a plurality (in this case four) of channel form sheet metal clips ls'extending parallel to the axis of hub 13. Such clips open radially outwardly and are provided with indentations such as 16 which are adapted to overlie one side edge of the brush strip channelform back 1. The other side edge of the brush strip back is spaced from the opposing side of the clip as best shown in Fig. 5 so that the brush strip may be inserted into such clips in a radial Y direction without necessity of axial threading. Such opposing sides of the clips have'longitudinally extending outwardly bulged portions 17 to receive tapered wedges 18 having inwardly directed indentations and corresponding protuberances 19 adapted to overlie the outer edge of the adjacent side of the brush strip back. The brush strip is thus firmly wedged in place and positively secured against outward movement under the influence of centrifugal force when the brush assembly is rotated at high speeds. Sleeve 14 may be press fitted, welded, screwed or otherwise secured to cylindrical hub member 13. Of course, clamping end plates or nuts may also be utilized in well-known manner when mounting the brush upon the usual brushing lathe or arbor. A plurality of sleeves 14 will be employed with the brush strip retaining clips of successive sleeves aligned parallel to the axis or circumferentially offset to receive brush strip of long lead helical conformation. The entering ends of tapered wedges 18 may be bent outwardly after such wedges have been driven home, further to secure the same against loosening under the effect of vibration in use.

It will be seen from the foregoing that I have provided a novel form of brush assembly adapted to utilize long lengths of brush strip (a relatively inexpensive form of brush element) in a manner facilitating replacement in the field. Such brush strip will in all cases have a long narrow self-supporting back portion (ordinarily somewhat flexible) and a layer of brush material secured to such back and protruding therefrom.

Other modes of applying the principle of the invention may be employed, change being made as regards the details described, provided the features stated in any of the following claims or the equivalent of such be employed.

I therefore particularly point out and distinctly claim as my invention:

1. In a power driven rotary brush having a central shaft, a plurality of axially spaced disc hub members mounted thereon, and lengths of brush strip secured thereto with brush material extending generally radially outwardly; means mounting said brush strip in said hub members comprising notches in the peripheries of said discs wide enough to receive the backs of said lengths of brush strip radially therein, flanges turned up from said discs extending normal thereto from one side of each said notch adapted to bear against and support one side of a brush strip back seated in such notch, a hub shoulder adjacent each said disc having a peripheral surface of the same radial extent as the bottoms of said notches and therefore adapted to support the radially inner surfaces of said brush strip backs, each notch having a recess in the side of such notch opposite said flange, a retaining strip having an outer edge portion hooked over the adjacent outer side edge of each said brush strip back seated in such notches in said hub discs and an inner edge portion turned outwardly toward the notch sides having such recesses, and tapered wedges inserted in said notches through such recesses bearing against said retaining strips and engaging said out-turned inner edge portion of the latter to prevent radial withdrawal of said brush strip from said notches while at the same time firmly seating the same. i

2. The brush assembly of claim 1 wherein said notches in successive discs are arranged in aligned rows parallel to the axis of said shaft so that said lengths of brush strip are likewise disposed parallel to such axis.

3. The brush assembly of claim 1 wherein said notches in successive discs are arranged in circumferentially ofiset relation to accommodate long lead helically formed lengths of brush strip received therein.

4. In a power driven rotary brush having a central shaft, a plurality of axially spaced disc hub members mounted thereon, and lengths of brush strip secured thereto with brush material extending generally radially outwardly; means mounting said brush strip in said hub .members comprising notches in the peripheries of said discs wide enough to receive the backs of said lengths of brush strip when inserted radially therein, retaining means engaging an outer edge of each length of brush strip seated in said notches, and wedge means inserted in said notches securing said retaining means and therefore said brush strip against withdrawal.

5. The brush assembly of claim 4 wherein said retaining means and said wedge means are separate elements, said notches having lateral recesses to receive said wedge means and said retaining means having protuber ances to engage said wedge means and thereby be held against withdrawal.

6. In a brushing tool having a plurality of co-axially spaced aligned disc members and lengths of brush strip having back portions received in notches in the outer peripheries of said discs and extending from disc to disc generally parallel to the axes thereof, such notches being wider than said back portions of said brush strip to permit insertion of said back portions in such notches radially inwardly of said discs relative to the axis thereof; means securing said lengths of brush strip in such notches comprising wedges inserted in such notches between one side thereof and said brush strip back, saidwedges interengaging the corresponding sides of said notches and including portions overlying radially outer edge portions of the brush strip back.

7. The brush assembly of claim 6 wherein said wedges are keyed into recesses in the adjacent notch sides.

8. In a brushing tool having a plurality of co-axially spaced aligned disc members and lengths of brush strip having back portions received in notches in the outer peripheries of said discs and extending from disc to disc generally parallel to the axes thereof, such notches being wider than said back portions of said brush strip to permit insertion of said back portions in such notches radially inwardly of said discs relative to the axis thereof; means securing said lengths of brush strip in such notches comprising wedges inserted in such notches between one side thereof and said brush strip back, said wedges interengaging the corresponding sides of said notches and also the adjacent sides of said brush strip back portions, said wedges being keyed into recesses in the adjacent notch sides and securing retaining means embracing outer edge portions of the brush strip back against outward withdrawal.

9. In a power driven rotary brush having a cylindrical hub portion; a plurality of axially spaced closely fitting sleeves secured thereon, a plurality of channel shaped brush strip retaining members secured to said sleeves with such channels opening radially outwardly thereof, lengths of brush strip having narrow elongated backs extending generally parallel to the axis of said hub between generally aligned axially spaced channel members on said respective sleeves and seated in said channel members, inward protuberances on one side of each channel member adapted to overlie and secure an adjacent brush strip back outer edge, the other sides of said channel members having longitudinal outwardly bulged portions therein, and wedges inserted in said channel members engaged in said bulged portions and effective to hold said brush strip backs beneath said protuberances.

10. The brush of claim 9 wherein said wedges are also provided with protuberances adapted to overlie and secure the other edge of the brush strip back.

11. In a brushing tool having a cylindrical hub portion; a plurality of channel shaped brush strip retaining members secured to said hub with such channels opening radially outwardly thereof, lengths of brush strip having narrow elongated backs extending generally parallel to the axis of said hub between generally aligned axially spaced channel members on said hub and seated in said channel members, inward protuberances'on one side of each channel member adapted to overlie and secure an adjacent brush strip back outer edge, the other sides of said channel members having recesses therein, and wedges inserted longitudinally in said channel members engaged in such recesses and effective to hold said brush strip backs beneath said protuberances, said wedges also being provided with protuberances adapted to overlie and secure the other edge of the brush strip back.

12. In a brushing tool having a central hub portion; a plurality of channel shaped brush strip retaining members secured to said hub with such channels opening radially outwardly With respect to the axis thereof, lengths of brush strip having narrow elongated backs extending generally parallel to the axis of said hub between generally aligned axially spaced channel members on said hub and seated in said channel members, means removably inserted longitudinally of said channel members between a side of the latter and the adjacent brush strip back firmly urging said back against the other sides of said channel members, means on such other sides of said channel members overlying the adjacent outer edge of said brush strip back, and retaining means on said removable means similarly adapted to overlie and secure the other outer edge of said brush strip back.

13. In a brush comprising a support and a length of brush strip releasably secured thereto; brush strip securing means comprising a recess in said support Wide enough to receive the elongated narrow chanel back of said brush strip inserted therein in a direction transversely of said back, latch means inserted in such recess between a side of such recess and said back parallel to the latter effective firmly to hold said back against the other side of such recess, said latch means engaging in a hollow 6 in a side of such recess, and means on both said latch and on the opposite side of such recess adapted to overlie the respective outer lips of said channel back to prevent outward withdrawal of the same from such recess until said latch has been removed.

14. A brushing tool having a cylindrical hub portion and circumferentially spaced channel-shaped brush strip retaining recesses thereon, lengths of brush strip having narrow elongated backs seated in said recesses, a constricting protuberance on one side of-each such recess adapted to overlie and secure an adjacent radially outer edge of the brush strip back, the other side of each said recess having a longitudinal notch therein, and wedges inserted longitudinally of said recesses engaging in said notches effective to hold said brush strip backs beneath said protuberances, said wedges being provided with protuberances adapted to overlie and secure the other radially outer edge of the brush strip back.

7 References Cited in the file of this patent UNITED STATES PATENTS 2,171,505 Curtis Feb. 15, 1916 2,523,823 Grzelczyk Sept. 26, 1950 2,605,490 Dolan Aug. 5, 1952 2,673,440 Sawyer Mar. 30, 1954 2,721,348 Blydenburgh Oct. 25, 1955 2,767,418 Lombardi Oct. 23, 1956 FOREIGN PATENTS 306,834 Great Britain May 1930 

